Download Section 25.2 Name_____________________

Section 25.2
Name_____________________ Per_______________
1. Identify the following as alpha, beta or gamma
a. _____________ a fast moving electron
b. _______________β
4
c. ________________
2
He
0
c. ______________ -1 e
d. _______________ He nucleus
f. _____________more energy than x-rays
e. ________________α
g. _______________2p + 2n h. ______________
2. Finish the equation: Hint: the total mass (top #) on the left side of the equation must equal the
total mass on the right side of the equation. The same is true for the atomic number (bottom #)
208
a. alpha decay of francium-208:
87Fr
→ _____________
+ ______________
37
b. beta emission by argon-37:
18Ar
→ _____________ +
_______________
Be + ____________
→ _________________
7
c. electron capture by beryllium-7:
4
3. Use the following word bank to complete the section below:
atomic number
nuclear bombardment
band of stability
positron
beta
billions
radioactive decay
half-life
rate
stable
made
transmutation
Nuclei that lie outside the _____________________ undergo spontaneous radioactive decay.
Nuclei with too many neutrons undergo ______________ emission as neutrons are converted to
protons and give off a high-speed electron. A ____________________ is a particle with a positive
charge and the mass of an electron.
Every radioisotope decays at a characteristic _______________. A ___________________ is the
time required for one half of the nuclei in a radioisotope to decay into another element. The product
nuclei may or may not be ______________________. Half-lives vary from fractions of a second to
________________ of years.
The conversion of atoms of one element to atoms of another is called _____________________.
This process can occur by _________________________ or by __________________________________
which is when particles bombard the nucleus of an atom. All of the elements with _________________
above 92 have been ________________ in nuclear reactors or accelerators.